Crystal and molecular structure of methyl 4,6-O-benzylidene-2-O-p-bromobenzenesulphonyl-3-cyano-3-deoxy-α-D-altropyranoside

Abstract

The crystal structure of methyl 4,6-O-benzylidene-2-O-p-bromobenzenesulphonyl-3-cyano-3-deoxy-α-D-altro-pyranoside (I) has been determined by three-dimensional X-ray analysis. The crystals are triclinic, space group P1, with Z= 1, a= 6·05, b= 7·39, and c= 12·62 Å, and α= 105·6, β= 97·4, and γ= 92·3°. The atomic parameters were determined by Fourier and least-squares calculations. The final value of R over 1810 independent reflexions is 12·2%. The pyranose ring is in a slightly flattened chair form and the O(methyl)⋯ C(cyano) separation is 3·03 Å.